Fan



FIG. 1 is a front view of the fan;

FIG. 2 is a rear view thereof;

FIG. 3 is a front perspective view thereof;

FIG. 4 is a side view thereof;

FIG. 5 is another side view thereof;

FIG. 6 is another side view thereof; and,

FIG. 7 is another side view thereof.

The broken line showing of portions of a fan is included for the purpose of illustrating environmental structure and forms no part of the claimed design. 

The ornamental design for a fan, as shown and described. 